Annealing box



July 3, 1923. 1,460,855

- l. F. LEHMAN I ANNEALI NG BOX Filed Dec. '4, 1920 INVENTOFI.

A In @QILMMH Patented July 3, 1923..

UNITED STATES PATENT OFFICE; A

IBIN F. LEHMAN, PITTSBURGH, PENNSYLVANIA, SSIGNOR T0 BLAW-KNOX COI-PANY, F PITTSBURGH, PENNSYLVANIA, CORPORATION 0F NEW JERSEY.

ANNEALING Application filed December 4, 1920. Serial No. 428,265.

T o all lwhom t may concern:

Be it known that I, IRviN F. LEHMAN, a citizen of the United "States,residing at Pittsburgh, in the county of Allegheny and State ofennsylvania, have invented a new and useful' Improvement in AnnealingBoxes, of which the following is a full, clear, and exact description',reference being had to the accompanying drawings, forming part of thisspecification, in which- Figure 1 is an end elevation of an annealinboxembodying my invention;

igure 2 is a to plan view of the same with a portion of t e top ,brokenaway;

Figure 3 is a detail sectional view showing one of rthe lifting pins; l

' Figure 4 is a detail sectional viPW illus trating one step in themanufacture of theJ box; and v Figure 5 is a detail sectional view takenthrough one of the -welded joints after completion.

My invention has relation'to annealing boxes and more artioularly 'toannealing boxes made up rom sheet metal plates united by Welding.

Heretofore, in annealing boxes of this type with which I am familiamthewelded joints are formed in such a manner as to inao crease thethickness of the metal at `the weld, leaving on the exterior of the boxmore or less of a shoulder or projection. Such shoulder or projection ispresent not only at the vertical weld or welds but also Where the top orcover portion of the box is welded upon the body portion. Suchprojections or' shoulders are extreme] objectionable in use "becausethey form suraces which catch the impingin llames and which are attacked40 by such ames with the result of rapid destruction-of the boxes atthese points.

My invention is desi ed to provide an annealin box formed rom sheetmetal in which a the Welds are made in such -a manner that they do ,notmaterially increase the wall thickness of the box at the Welds,particularly at the outer surfaces of the bo'x.

In this manIier'I am able to provide a box which is of substantiallyuniform wall thickness throughout; which is freel Afrom any shoulders orledges of a character to form impinging points for flames.; and

which, when completed, is, for all practical purposes a one-piece box.

In aoordance with my invention I preferably form the body 2 of the boxof a single sheet or-plate of metal which is bent into generallyrectangular form, vwith rounded corners 3, the free edges of the platebeing brought together and welded. While this Welded joint maybe made inany desired part of the box body, Iprefer that it shall be at one endthereof, as indicated by the dotted line 4 in Figure 1.

5 designates the top or cover portion o1 the box which can be readilyshaped from a.

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single piece of metal and which is continuously welded to the upper edgeof the lloody6portion 2, as indicated by the dotted ine The welds at 4and 6 are preferably made by the water-gas hammer method. The edgeportions to be welded are overlapped at a l distance vabout equal to thethickness of the metal, as indicated in Figure 4. The overlappedportions are then brought to a Welding heat by the use of a water-gas4flame and the parts are then hammered until a homogeneous weld ismade,the excess'metal' at the joint being thoroughly distributed so that inthe finished article the joint is o substantiall of welding is referablyused because in such a method t e metal may be brought to and' kept atthe proper temperature Without danger of burning the metal.

f? design-ate lifting pins which are welded to opposite sides of the boxin any suitable manner, such as indicated in Figure 3. In this figurethe lifting pinsare shown as h-avform attacking points for the flames.

the same thickness as the bal- I ance of the oxjwall. The water-gasmethod ing beveled heads which are abutted against external shoulders|at the It will, of course, be understood that the boxes may takevarious other specific shapes and that other changes may be made thereinwithin the spirit and scope of the appended claims.

I claim:

l. As a new article o f manufactura'an annealing box" comprising a sheetmetal body, and a sheet metal top portion, said body and top portionsbeing united by a continuous weld, the-outer surface of which issubstantially flush with the general surface of the box whereby the boxis free from joints, substantially as described.

2. As a new article of manufacture, an annealing box comprising a sheetnietal body, and a sheet metal top portion, said body and top portionsbeing united by a continuous weld,kthe outer surface of which issubstan- 'tially Hush with the general surface of the box whereby thebox is free from any external shoulder at the junction of the body andtop, said body being formed from a s ingle bent sheet or plate havingits vertical` edges brought together and united by a weld, the outersurface of which is also substantially Hush with the general surface ofthe box, substantially as described.

3. As a new article of manufacture, an -annealing box comprising a sheetmetal body and a sheet metal top portion, said body and top portionsbeing united by' a continuous welded joint, the metal at the joinrtbeing of substantially the' same thickness as the other portions of thebox, substantiallv as described.

4:. As a newarrticle of manufacture, an annealing box comprising agenerally rectangular body portion having rounded corners, and formedfrom a single sheet or plate of metal bent upon itself with its edgesbrought together and welded, the metal at the weld being ofsubstantially the same thickness as the other portions of the body, andatop portion continously welded to the upper portion of the body, themetal at this weld being of substantially the same thickness as themetal element in the body, substantially 21S-described.

5. As a new Aarticle of manufacture, an annealing box formed of separatesheet metal sections welded together, said'box being freefrom externalshoulders or ledges at the joints, substantially as described.

In testimony whereof, I have hereunto set my hand.

IRVIN F. LEHMAN.

